Re: 1541 ROM areas recognition

From: silverdr_at_wfmh.org.pl
Date: Thu, 7 Nov 2013 00:04:06 +0100
Message-Id: <716C9DF4-9EAB-46B4-BCB9-671B5B0B247F@wfmh.org.pl>
On 6 lis 2013, at 22:44, Groepaz <groepaz@gmx.net> wrote:
> 
>> Is there a reliable, software way of recognising ROM areas of a 1541 (all
>> models)? I mean without knowing what kind of ROM is actually installed. I
>> assume that all of them have to cover up to the end of 6502 address space
>> (if not for anything else then at least due to h/w vectors) but what about
>> the starting point(s) and what if there happen to be some non-contiguous
>> chunks?
> 
> not sure if i understand the question correctly.... but to find out if there 
> is rom or ram at a certain address, write to it and see if the value changed? 
> (backup/restore the original value ofcourse)

Well, finding RAM would be as easy as you wrote. What is needed though is to distinguish ROM from all other (than ROM) types of things that may dangle around the corners of address space. Not only RAM. Those may be RAM but also e.g. port chips, gaps, unconnected address ranges..

-- 
SD!
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Received on 2013-11-07 00:00:05

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